I'm trying to solve two non-linear equations using fsolve

Hi I am trying to solve the two non-linear equations below with the initial x = 6 and y =6. I keep getting errors shown at the bottom that I dont understand how to fix. Any suggestions?

% Given: two non-linear simutaneous equations

% f(x,y) = 4 - y - 2x^2 and g(x,y) = 8 - y^2 - 4x

% Find:

% (1) Provide a function for storing f and g

% (2) Provide a test script to call the function storing the system

% of nonlinear equations and solve the two equations. Use xo = 6 and

% yo=6 as initial values.

% Solution:

% Let the initial conditions be plugged into the equations.

[x,fx] = fsolve(@fun,[6;6]);

% Set up the functions that will store the equations that can be

% called

function [f,g] = fun(x,y)

f = 4-y-2*x^2;

g = 8-y^2-4*x;

end

ERRORS I RECIEVED:

Not enough input arguments.

Error in Homework4_5>fun (line 36)

f = 4-y-2*x^2;

Error in fsolve (line 264)

fuser = feval(funfcn{3},x,varargin{:});

Error in Homework4_5 (line 29)

[x,fx] = fsolve(@fun,[6;6]);

Caused by:

Failure in initial objective function evaluation. FSOLVE cannot continue.

Answer 1

[Torsten]

Variables and residuals must be put into one single vector:

[x,fx] = fsolve(@fun,[6;6])

Equation solved.

fsolve completed because the vector of function values is near zero
as measured by the value of the function tolerance, and
the problem appears regular as measured by the gradient.

x = 2×1

1.0000 2.0000

fx = 2×1

1.0e-09 * -0.4071 -0.0670

% Set up the functions that will store the equations that can be
% called
function res = fun(z)
  x = z(1);
  y = z(2);
  f = 4-y-2*x^2; 
  g = 8-y^2-4*x;
  res = [f;g];
end